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(11) | EP 2 090 899 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Method and system for determining velocity by using variable or distinct sampling rates |
| (57) A data processor (22) applies transform processing to a first group of samples at
a primary sampling rate, where the first group of samples is within a data window
associated with at least one of the data blocks. A detector detects an estimated frequency
shift between the transmitted signal and the reflected signal based on a primary peak
frequency determined by the transform processing at the primary sampling rate. The
data processor (22) applies transform processing to a second group of samples at a
secondary sampling rate, where the data window contains previously read samples and
at least one new sample, if the estimated frequency shift falls within a target response
frequency band. The detector detects an observed frequency shift between the transmitted
signal and the reflected signal based on a secondary peak frequency determined by
the transform processing at the secondary sampling rate. A velocity estimator (27)
for estimating a velocity of at least one of the object (14) and the transmitter (10)
based on the estimated frequency shift, the observed frequency shift, or both.
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